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In future fault-tolerant quantum computers, errors resulting from noise and decoherence must be detected and corrected in real-time. This is particularly important while applying operations between different elements, which can cause errors to quickly spread throughout the system.
In this talk, I will present an error-corrected construction for operations on a cavity-encoded logical qubit [1]. The scheme uses the multilevel structure of a transmon ancilla, along with RF-tunable transmon-cavity interactions, to apply a broad range of operations on a variety of encodings, while protecting the logical qubit against photon loss, as well as ancilla decay and dephasing. We show that the fidelity of the operations is substantially improved when using the error-corrected implementation compared to the non-corrected one. These results present an important step towards fully fault-tolerant processing of logical bosonic qubits.
[1] P. Reinhold, SR, et al, Nat. Phys. 16, 822-826 (2020).
Dr. Serge Rosenblum was born and raised in Antwerp, Belgium, and moved to Israel in 2004 to study physics and electrical engineering at the Technion. Dr. Rosenblum earned his PhD at the Weizmann Institute in 2014, where he investigated quantum interactions of single photons with atoms, leading to several breakthroughs [1-3].
In 2015, he joined Prof. Robert Schoelkopf’s lab at Yale University as a postdoctoral fellow. There, he developed strategies for fault-tolerant quantum operations [4], which are necessary to enable quantum computers to operate despite noise and imperfections. These advances helped him develop what is currently the world’s longest-lived artificial quantum bit [5].
Dr. Rosenblum joined the Weizmann Institute’s Department of Condensed Matter Physics in April 2019. He heads the superconducting quantum circuits lab, focusing on the elementary building blocks needed to achieve quantum information processing. He is particularly interested in finding new ways to prevent those building blocks from quickly “collapsing”, which is a major obstacle towards realizing useful quantum computers.
Dr. Rosenblum was awarded the Alon Young Faculty Fellowship in 2020, and the John F. Kennedy Excellence Award for PhDs in 2015.
[1] Science 345, 903–906 (2014)
[2] Nature Photonics 10, 19-22 (2016)
[3] Nature Physics 14, 996-1000 (2018)
[4] Nature Physics 16, 822–826 (2020)
[5] Science 361, 266-270 (2018)